CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Comprehensive income, net of tax:
Net income		$ 166,623	$ 202,326	$ 126,719
Other comprehensive income (loss):
Interest rate swaps (a)	[1]	(9)	2,196	40
Capitalized swap interest expense (b)	[2]	(170)	(203)	(217)
Pension adjustment (c)	[3]		(890)
Other comprehensive income (loss)		(179)	1,103	(177)
Comprehensive income		166,444	203,429	126,542
Comprehensive income attributable to noncontrolling interests		1,781	(23)
Comprehensive income attributable to common stockholders		$ 168,225	$ 203,406	$ 126,542

[1] Net of deferred tax benefit of $0.3 million for the year ended December 31, 2017, and deferred tax expense of $1.3 million and $1.0 million for the years ended December 31, 2016 and 2015, respectively.

[2] Net of deferred tax benefit of $0.1 million, $0.1 million and $0.1 million for the years ended December 31, 2017, 2016 and 2015, respectively.

[3] Net of deferred tax benefit of $0, $0.5 million and $0 for the years ended December 31, 2017, 2016 and 2015, respectively.